CN213048842U

CN213048842U - Liquid filtering device, respiratory mask, respiratory tube and respiratory support equipment

Info

Publication number: CN213048842U
Application number: CN202020976581.3U
Authority: CN
Inventors: 周明钊; 庄志
Original assignee: BMC Medical Co Ltd
Current assignee: BMC Medical Co Ltd
Priority date: 2020-06-01
Filing date: 2020-06-01
Publication date: 2021-04-27
Anticipated expiration: 2030-06-01

Abstract

The utility model relates to the field of medical equipment, a liquid filter equipment, respirator, respiratory tube and breathing support equipment is disclosed. The liquid filtering device comprises a vent pipe, a liquid-proof breathable film and a gas-liquid one-way valve, wherein an internal channel of the vent pipe is formed into a gas flow passage, the liquid-proof breathable film is a breathable, waterproof and vapor-permeable membrane and is arranged on one side, close to an exhaust end, of the gas flow passage, the gas-liquid one-way valve is arranged on one side, close to an air inlet end, of the gas flow passage at intervals along the axial direction of the gas flow passage, and the inner surface of the gas flow passage is a smooth. The liquid filtering device can allow gas such as gas with humidity to pass through and can block liquid possibly carried in flowing gas flow, and when the liquid filtering device is used for delivering respiratory gas, condensed water possibly carried in the gas in a respiratory tube can be collected and blocked, so that the problem that the condensed water is gathered and blown to the face, the mouth and the nose to cause discomfort is solved.

Description

Liquid filtering device, respiratory mask, respiratory tube and respiratory support equipment

Technical Field

The utility model relates to the technical field of medical equipment, specifically relate to a liquid filter equipment, a respirator, a respiratory tube and a breathe supporting equipment.

Background

In recent years, with the technology of noninvasive respiratory support equipment becoming mature, noninvasive respiratory support equipment has become an important means for treating early chronic respiratory failure and chronic obstructive pulmonary disease. With the increasing development of respiratory support devices, devices have emerged that are capable of providing gases at higher humidity. When the gas of high humidity passes through breathing gas pipeline, can gather on breathing gas pipeline's internal surface and condense into the water droplet, and can form ponding phenomenon along with the gathering increase of condensate water droplet, ponding can be blown to patient's face and mouth nose department by breathing gas carrying, leads to uncomfortable feeling.

For this reason, some of the prior art techniques have been developed to increase the temperature in the breathing gas conduit by adding a heating device to the conduit to mitigate the condensation. Some techniques are provided with the comdenstion water collecting container in breathing gas pipeline, can collect the comdenstion water in the container, and the untimely clearance pour the comdenstion water can, however, because the comdenstion water collecting container is bulky, the comdenstion water collecting container is set up on the breathing machine or set up the intermediate position in breathing gas pipeline usually and reduces the stumbling to respirator. If the setting is in respirator position department, then it is great to catch on respirator, in addition, in the use or topple over the comdenstion water after using, the operation is comparatively loaded down with trivial details.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a liquid filtering device, this liquid filtering device can allow gaseous for example to have the gas of humidity to pass through to can block the liquid that probably carries in the air current that flows, like this, when this liquid filtering device is used for carrying the breathing gas, can collect the comdenstion water that the gas probably carried in the breathing pipe and block, thereby solve because of the comdenstion water gathers and is blown face and mouth nose department and produce the problem of uncomfortable sense.

Therefore, the utility model provides a liquid filtering device, this liquid filtering device are arranged in filtering the liquid that carries in the mobile air current, liquid filtering device includes breather pipe, liquid-proof ventilated membrane and gas-liquid check valve, the internal passage of breather pipe forms into the gas flow way, the liquid-proof ventilated membrane is ventilative waterproof and the diaphragm of vapor that permeates water and sets up the one side that is close to the exhaust end of gas flow way, the gas-liquid check valve along the axial direction interval of gas flow way sets up the one side that is close to the inlet end of gas flow way, wherein, the internal surface of gas flow way is smooth internal surface.

In the technical scheme, the liquid-proof and breathable film is a breathable and waterproof and vapor-permeable film and is arranged on one side, close to the exhaust end, of the gas flow channel, so that flowing gas flow can be discharged from the gas flow channel through the liquid-proof and breathable film after entering the gas flow channel through the gas-liquid one-way valve, and liquid possibly carried in the gas flow can be discharged from the gas flow channel through the liquid-proof and breathable film after entering the gas flow channel through the gas-liquid one-way valve, so that the liquid-proof and breathable film can block liquid in the gas flow channel to be discharged.

Further, the gas-liquid one-way valve comprises a valve plate capable of being opened and closed, and the valve plate can be opened under the action of gas flow flowing into the vent pipe and can be closed after the gas flow disappears.

Still further, the gas-liquid one-way valve comprises a valve cylinder, wherein the valve plate is formed at the second open end of the first end of the valve cylinder, the valve cylinder is positioned in the air inlet end of the vent pipe, and the first end of the valve cylinder faces outwards.

Further, the valve cylinder is a tapered cylinder, and the second end of the tapered cylinder is formed as a flat end such that two cylinder wall portions of the flat end serve as the valve sheet, respectively.

Further, the gas-liquid check valve includes a connection flange formed on an outer peripheral surface of the first end of the valve cylinder, the connection flange being provided on an end surface of the intake end of the breather pipe and the valve cylinder being located inside the intake end of the breather pipe.

In addition, the gas-liquid one-way valve comprises a valve port and a valve ball connected with a spring, the valve ball can overcome the spring under the action of gas flow to open the valve port, and after the gas flow stops passing through, the valve ball can cover the valve port again under the action of the spring to close the valve port.

In addition, the vent pipe comprises a channel section positioned between the gas-liquid one-way valve and the liquid-proof and breathable film, and the channel section is integrally formed into a liquid absorption and volatilization part capable of absorbing and volatilizing liquid entering the channel section along with the airflow.

Further, the liquid filtering device further comprises a heating unit for raising the temperature of the liquid-absorbing volatile part.

Further, the liquid filtering device also comprises a containing cylinder and a cylinder cover, and the vent pipe is arranged in the containing cylinder and is kept in position by the cylinder cover; a gas through hole communicated with the gas inlet end of the gas flow channel is formed in the accommodating cylinder, and a gas through hole communicated with the gas outlet end of the gas flow channel is formed in the cylinder cover; the wall of the containing cylinder is provided with a volatilization opening.

Furthermore, the containing barrel comprises a heating plug end, and a heating coil connected with the heating plug end is arranged on the opening edge of the volatilization opening.

Still further, the containing barrel comprises a plurality of the volatilization openings which are arranged at intervals in the circumferential direction, and the parts of the containing barrel, which are positioned between the adjacent volatilization openings, are formed into supporting strips, and each supporting strip is embedded with the heating coil.

Further, the cover includes sealed holding tank of filling up and centers on the sealed annular joint shirt rim that the holding tank of filling up was arranged, hold the section of thick bamboo and connect the turn-ups including the annular, be provided with sealed the pad in the sealed holding tank of filling up, annular joint shirt rim with the cooperation of turn-ups joint is connected in order to support the pressure to sealed the pad, sealed pad will prevent that the edge of liquid ventilated membrane supports and presses on the terminal surface of breather pipe exhaust end.

Additionally, the utility model provides a breathing mask, including the face guard body with above arbitrary liquid filtering device, wherein, the breather pipe is connected in order to be used for connecting the breathing pipe on the face guard body, the gas-liquid check valve is kept away from the setting of face guard body. Thus, as mentioned above, the liquid filtering device can collect condensed water possibly carried by gas in a breathing pipe connected with the breathing mask, thereby solving the problem that the condensed water is gathered and blown to the face, mouth and nose to cause uncomfortable feeling. Simultaneously, because this liquid filter equipment volume is less and light and handy, consequently can connect on breathing mask and can not be to influencing breathing mask's normal use, promoted this breathing mask's whole quality.

Additionally, the utility model provides a respiratory tube, be connected with above arbitrary on the respiratory tube liquid filtering device. Thus, as mentioned above, the liquid filtering device can collect the condensed water possibly carried by the gas in the breathing tube, thereby solving the problem of uncomfortable feeling caused by the condensed water being gathered and blown to the face, mouth and nose.

Finally, the utility model provides a breathe support equipment, include more than through respiratory mask and the breathing machine that the respiratory tube is connected, wherein, prevent liquid ventilated membrane orientation respiratory mask sets up, the gas-liquid check valve orientation the breathing machine sets up.

Drawings

FIG. 1 is an exploded view of a liquid filtration device according to an embodiment of the present invention;

FIG. 2 is an assembly view of FIG. 1;

FIG. 3 is a schematic view of the vent pipe of FIG. 1;

FIG. 4 is a schematic view of the construction of the cartridge cover of FIG. 1;

FIG. 5 is a cross-sectional view of the cartridge cover of FIG. 4;

fig. 6 is a perspective view of the gas-liquid check valve in fig. 1;

FIG. 7 is a cross-sectional view of the gas and liquid check valve of FIG. 6;

FIG. 8 is a schematic view of a heating coil used in the containment drum of FIG. 1;

FIG. 9 is a cross-sectional view taken along line B-B of FIG. 2;

FIG. 10 is a schematic view of the liquid filtering device of FIG. 1 in use;

fig. 11 is a schematic structural view of a gas-liquid check valve in a liquid filtering device according to an embodiment of the present invention;

fig. 12 is another schematic structural diagram of a check valve for liquid in a liquid filtering device according to an embodiment of the present invention.

Description of the reference numerals

1-vent pipe, 2-liquid-proof and breathable film, 3-gas-liquid one-way valve, 4-valve plate, 5-valve cylinder, 6-flat end, 7-connecting flange disc, 8-containing cylinder, 9-cylinder cover, 10-volatilization opening, 11-heating plug end, 12-heating coil, 13-supporting strip, 14-cylinder connector pipe, 15-cover connector pipe, 16-sealing gasket containing groove, 17-arc clamping skirt edge, 18-annular connecting flange edge, 19-sealing gasket, 20-breathing pipe, 21-breathing mask, 22-respirator, 23-volatilization fin, 24-spring and 25-valve ball.

Detailed Description

In the present invention, the embodiments and the features of the embodiments may be combined with each other without conflict. The present invention will be described in detail with reference to the accompanying drawings in conjunction with embodiments.

Referring to fig. 1, 2 and 3, the liquid filtering device provided by the present invention is used for filtering liquid carried in flowing air flow, and comprises a vent pipe 1, a liquid-proof and breathable film 2 and a gas-liquid one-way valve 3, wherein an internal channel of the vent pipe 1 is formed as a gas flow passage, the liquid-proof and breathable film 2 is a membrane permeable to water, water and vapor so as to isolate condensed water along the gas flow direction in the gas flow passage of the vent pipe 1, preferably, the liquid-proof and breathable film 2 is disposed on one side of the gas flow passage close to an exhaust end, and the liquid-proof and breathable film 2 and the gas-liquid one-way valve 3 are disposed on one side of the gas flow passage close to an intake end at intervals along the axial direction of the gas flow passage, wherein the inner surface of the gas flow passage is.

In addition, in this liquid filtering apparatus, the gas-liquid check valve 3 may have various structures, and it should be understood that, whichever structure is adopted, it is sufficient if gas is allowed to enter the gas flow passage through the gas-liquid check valve 3 and is closed after the gas stops entering. For example, in one structure, as shown in fig. 11, the gas-liquid check valve 3 includes a valve port and a valve ball 25 connected with a spring 24, under the action of gas flow (as shown by an arrow), the valve ball 25 can overcome the spring 24 to open the valve port, and after the gas flow stops passing through, the valve ball 25 covers the valve port again under the action of the spring 24 to close the valve port. Alternatively, in another structure, referring to the structures shown in fig. 1, 6 and 7, the gas-liquid check valve 3 includes a plurality of, for example, two, valve plates 4 that can be opened and closed, and the valve plates 4 can be arranged oppositely when the valve plates 4 are multiple, for example, two, and can be opened under the action of the gas flow flowing into the breather pipe 1 and closed after the gas flow disappears, so that under the action of the gas flow, the valve plates 4 will be opened, for example, the two oppositely arranged valve plates 4 are far away from each other and opened. In addition, the gas-liquid check valve 3 may include a pair of valve plates 4 (two valve plates 4 are arranged oppositely), or the gas-liquid check valve 3 may also include a plurality of pairs of valve plates 4. The valve plate 4 may be a metal sheet or a rubber sheet.

In addition, the valve plate 4 may have a suitable thickness (i.e., a thickness in the left-right direction in fig. 7), for example, the thickness of the valve plate 4 is 0.1-05mm, so that the valve plate 4 is easily opened by the air flow and is easily closed after the air flow passes through, preferably 0.2-0.4mm, and preferably 0.3 mm. Of course, the valve plate 4 may have other thicknesses, for example, the thickness of the valve plate 4 may be more than 0.06mm, as long as the valve plate can be opened under the action of the airflow and closed after the airflow passes through the valve plate.

In addition, as shown in fig. 6 and 7, the gas-liquid check valve 3 includes a valve cylinder 5, a first end of the valve cylinder 5 is open, and a valve plate 4 is formed at a second end of the valve cylinder 5, so that the valve cylinder 5 can be inserted into the other end of the breather pipe 1, so that the valve cylinder 5 is located in the air inlet end of the breather pipe 1 and the first end of the valve cylinder 5 faces outward, so that the air flow can enter from the open first end of the valve cylinder 5, and then the valve plate 4 is driven to open to enter the gas flow passage.

In addition, the second end of the valve cylinder 5 can form the valve plate 4 through various structural forms, for example, in one structural form, as shown in fig. 12, the second end of the valve cylinder 5 is formed with an end wall, a strip-shaped opening is formed on the end wall, the valve plate 4 is respectively connected to two sides of the outer side of the strip-shaped opening, and the two valve plates 4 are obliquely arranged towards each other, so that the air flow (shown by an arrow in the figure) in the valve cylinder 5 drives the two valve plates 4 to be separated to allow the air flow to pass through, and after the air flow passes through, the two obliquely arranged valve plates 4 are attached again to be closed. Alternatively, in another structure, as shown in fig. 6 and 7, the valve cylinder 5 is a conical cylinder, and the second end of the conical cylinder is formed into a flat end 6, so that two cylinder wall parts of the flat end 6 are respectively used as the valve plates 4, and thus, the air flow in the valve cylinder 5 is easier to accelerate under the guiding action of the conical cavity to drive the two cylinder wall parts of the flat end 6 to separate for passing.

In addition, as shown in fig. 6 and 7, the gas-liquid check valve 3 includes a connection flange 7, the connection flange 7 is formed on the outer peripheral surface of the first end of the valve cylinder 5, the connection flange 7 is provided on the end surface of the other end of the breather pipe 1 and the valve cylinder 5 is located inside the other end of the breather pipe 1. Thus, the connection flange 7 may be welded, bonded, or connected to the end surface of the other end of the breather pipe 1 by a connector such as a screw, so that the valve cylinder 5 is located entirely inside the other end of the breather pipe 1.

In one embodiment, the connecting flange 7 and the valve cartridge 5 are formed integrally, for example as a silicone cone, the other end of which is a flat end 6.

In addition, in this liquid filter device, the vent pipe 1 includes a passage section located between the gas-liquid check valve 3 and the liquid-proof and gas-permeable membrane 2, at least a part of the passage section is a liquid-absorbing and volatilizing portion, and preferably, the passage section is integrally formed as a liquid-absorbing and volatilizing portion capable of absorbing and volatilizing the liquid entering the passage section with the gas flow. Like this, gaseous can be through the gas-liquid check valve 3 enter into the gas channel in back can be discharged from the gas channel through preventing liquid ventilated membrane 2, and gaseous liquid that can carry passes through the gas-liquid check valve 3 and gets into the gas channel in back, prevent that liquid ventilated membrane 2 blocks the liquid discharge in the gas channel, like this, the imbibition volatile portion can adsorb the liquid in the gas channel and volatilize to the outside, need not to pour out the water of collecting in the comdenstion water collecting vessel manually with prior art. Therefore, when the liquid filtering device is used for delivering the breathing gas, the condensed water possibly carried by the gas in the breathing tube can be collected and adsorbed to volatilize to the outside, so that the problem of discomfort caused by the fact that the condensed water is gathered and blown to the face, the mouth and the nose is solved.

In addition, the liquid-absorbing volatile part can be a liquid-absorbing volatile material which can rapidly absorb, diffuse and volatilize water and has small air permeability, and can be a lighter material such as graphene, porous ceramic, activated carbon and the like.

In addition, the internal surface of gas flow channel is smooth internal surface, like this, because smooth internal surface is changeed gaseous flow on the internal surface, has alleviateed the blockking that the gas flows, consequently, can alleviate the sound that produces when gaseous passes through gas flow channel effectively to reach the silence effect, promoted the travelling comfort that the patient used. Of course, in other embodiments, the inner surface of the gas flow passages may be a non-smooth inner surface.

In addition, as shown in fig. 3, the volatilization fin 23 is formed on the outer surface of the liquid-absorbing volatilization part, so that the volatilization fin 23 can increase the contact area of the liquid-absorbing volatilization part with the external environment, thereby making it easier for the liquid, such as water, adsorbed by the liquid-absorbing volatilization part to volatilize to the outside. Of course, the volatilization fin 23 may have various shapes, for example, in fig. 3, when the vent tube 1 is integrally formed as a liquid-suction volatilization tube, the volatilization fin 23 may be a straight piece extending radially outward extending in the axial direction of the vent tube 3, and the straight piece may extend from one end face to the other end face of the vent tube 3. Alternatively, the volatilization fins 23 can be circumferentially extending annular fins or spiral fins.

In addition, liquid filtering device still includes the heating element who is used for improving the imbibition part of volatilizing's temperature, like this, improves the imbibition part of volatilizing's temperature through the heating element, can promote the imbibition of imbibition part of volatilizing and volatilize efficiency for the liquid that enters into in the gas flow channel for example the comdenstion water can be adsorbed more fast and volatilizees. Of course, the type and arrangement position of the heating unit may have various ways. For example, the heating unit may be a heating strip disposed on the outer circumferential surface of the vent tube 1 around the liquid suction volatilization section.

In addition, as shown in fig. 1 and 2, the liquid filtering device further comprises a containing cylinder 8 and a cylinder cover 9, wherein the vent pipe 1 is arranged in the containing cylinder 8 and is kept in position by the cylinder cover 9; a gas through hole communicated with the gas inlet end of the gas flow channel is formed in the accommodating cylinder 8, a gas through hole communicated with the gas outlet end of the gas flow channel is formed in the cylinder cover 9, so that gas flow enters from the gas through hole in the accommodating cylinder 8, enters the gas flow channel after passing through the gas-liquid one-way valve 3, then passes through the liquid-proof and gas-permeable membrane 2 and is discharged from the gas through hole in the cylinder cover 9, and the gas through holes in the accommodating cylinder 8 and the cylinder cover 9 are conveniently connected with an external pipeline; the wall of the containing cylinder 8 is formed with volatilization openings 10 so that the liquid-absorbing volatilization parts are exposed to the outside. As shown in fig. 1 and 2, the wall of the containing cylinder 8 is formed with a plurality of circumferentially spaced volatilization openings 10, each volatilization opening 10 extending axially. Of course, the shape of the volatilization opening 10 is not limited to the shape shown in fig. 2, and the volatilization opening 10 can also have other shapes.

In addition, as shown in fig. 2, the accommodating cylinder 8 includes a heating plug 11, and a heating coil 12 connected to the heating plug 11 is disposed at the edge of the volatilization opening 10, so that the heating plug 11 can be connected to the respiration support device through a connecting wire or can be connected to an external power line to perform a heating function of the heating coil 12.

In addition, as shown in fig. 2, the containing cylinder 8 comprises a plurality of circumferentially spaced volatilization openings 10, and the parts of the containing cylinder 8 between adjacent volatilization openings 10 are formed into supporting strips 13, and each supporting strip 13 is embedded with a heating coil 12, as shown in fig. 8 and 9. Like this, heating coil 12 circular telegram back, a plurality of support strips 13 will be heated to heating the periphery of breather pipe 1, the breather pipe 1 that the temperature promoted then can improve the imbibition efficiency of volatilizing, makes the liquid that enters into in breather pipe 1 for example the comdenstion water can be adsorbed more fast and volatilize.

Further, in order to facilitate the connection of the liquid filtering apparatus to the external pipe, as shown in fig. 1 and 2, the receiving cylinder 8 and the cylinder cover 9 respectively include a cylinder joint pipe 14 and a cover joint pipe 15 provided at the respective gas passing ports, so that the liquid filtering apparatus can be connected in the pipe by the connection of the cylinder joint pipe 14 and the cover joint pipe 15 to the respective corresponding pipes with reference to the embodiment shown in fig. 10.

In addition, the connection mode of the accommodating cylinder 8 and the cylinder cover 9 can be various, for example, the accommodating cylinder 8 and the cylinder cover 9 can be connected in a threaded manner or clamped, or as shown in fig. 1, 4 and 5, the cylinder cover 9 comprises a sealing gasket accommodating groove 16 and an annular clamping skirt 17 arranged around the sealing gasket accommodating groove 16, the accommodating cylinder 8 comprises an annular connecting flange 18, a sealing gasket 19 is arranged in the sealing gasket accommodating groove 16, the annular clamping skirt 17 and the annular connecting flange 18 are in clamping fit to press the sealing gasket 19, and the sealing gasket 19 presses the edge of the liquid-proof and breathable membrane 2 against the end face of the exhaust end of the vent pipe 1, so that the connection between the accommodating cylinder 8 and the cylinder cover 9 can press the sealing gasket 19 and the liquid-proof and breathable membrane 2 against the end face of one end of the vent pipe 1. The gasket 19 can make the cylinder cover 9 form a sealing communication with the liquid-proof and gas-permeable membrane 2 and the breather pipe 1.

Additionally, the utility model provides a breathing mask, this breathing mask include the face guard body and above arbitrary liquid filtering device, wherein, breather pipe 1 is connected on the face guard body in order to be used for connecting the breathing pipe, for example lid joint pipe 15 can connect on the face guard body, and the setting of face guard body is kept away from to gas-liquid check valve 3. Thus, as mentioned above, the liquid filtering device can collect condensed water possibly carried by gas in a breathing pipe connected with the breathing mask, and preferably adsorb and volatilize the condensed water to the outside, thereby solving the problem that the condensed water is gathered and blown to the face, the mouth and the nose to cause discomfort. Simultaneously, because this liquid filter equipment volume is less and light and handy, consequently can connect on breathing mask and can not be to influencing breathing mask's normal use, promoted this breathing mask's whole quality.

Additionally, the utility model provides a respiratory tube is connected with above arbitrary on this respiratory tube liquid filtering device. Thus, as mentioned above, the liquid filtering device can collect condensed water possibly carried by gas in the breathing tube, and preferably adsorb and volatilize the condensed water to the outside, thereby solving the problem of uncomfortable feeling caused by the condensed water being gathered and blown to the face, mouth and nose.

Of course, the liquid filtering device can be disposed at any location of the breathing tube, for example, the liquid filtering device can be disposed on at least one of an air inlet end of the breathing tube, a middle of the breathing tube, an air outlet end of the breathing tube. Referring to fig. 10, for example, the liquid filtering device may be disposed at an end C of the breathing tube for connection to the ventilator 22, or the liquid filtering device may be disposed at any intermediate location of the breathing tube, such as location E, for example, the breathing tube comprises two tube segments that are connected at respective ends of the ventilation tube 1, such as at the canister connector tube 14 and the cap connector tube 15. Or, the liquid filtering device is connected to one end position, such as end D, of the breathing tube for connecting the breathing mask, so that the breathing tube only needs to be connected with the breathing mask by the breathing tube 1 in actual use, for example, the joint pipe 15 is connected with the breathing mask, and thus even if condensed water possibly existing in the breathing tube enters the breathing tube 1, the liquid absorption volatilization part can adsorb and volatilize the condensed water.

Finally, the utility model provides a breathe support equipment, this breathe support equipment include through above arbitrary respirator 21 and breathing machine 22 that respiratory tube 20 connect, wherein, prevent that liquid ventilated membrane 2 sets up towards respirator 21, and gas-liquid check valve 3 sets up towards breathing machine 22. Thus, as described above, the quality of the respiratory support apparatus is effectively improved by the liquid filtering device.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto. The technical scheme of the utility model in the technical conception scope, can be right carry out multiple simple variant. Including each of the specific features, are combined in any suitable manner. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations. These simple variations and combinations should also be considered as disclosed in the present invention, all falling within the scope of protection of the present invention.

Claims

1. A liquid filtering device for filtering liquid carried in flowing air current, characterized in that, the liquid filtering device includes breather pipe (1), liquid-proof and breathable membrane (2) and gas-liquid one-way valve (3), the internal channel of breather pipe (1) forms into the gas flow channel, the liquid-proof and breathable membrane (2) is the membrane of ventilating, watertight and permeable to water vapor and sets up the gas flow channel one side near the exhaust end, gas-liquid one-way valve (3) along the axial direction interval of gas flow channel sets up the gas flow channel one side near the inlet end, wherein, the internal surface of gas flow channel is smooth internal surface.

2. Liquid filtering device according to claim 1, characterized in that said gas-liquid non-return valve (3) comprises a flap (4) that can be opened and closed, said flap (4) being able to be opened by the gas flow that flows into said breather pipe (1) and to be closed after said gas flow has disappeared.

3. The liquid filtering device according to claim 2, characterized in that the gas-liquid one-way valve (3) comprises a valve cylinder (5), the valve cylinder (5) is provided with the valve sheet (4) at a first end and a second end, the valve cylinder (5) is positioned in the gas inlet end of the breather pipe (1), and the first end of the valve cylinder (5) faces outwards.

4. A liquid filter arrangement according to claim 3, characterized in that the valve cartridge (5) is a conical cartridge, the second end of which is formed as a flat end (6) so that the two cartridge wall parts of the flat end (6) each serve as the valve plate (4).

5. A liquid filtering device according to claim 3, wherein the gas-liquid check valve (3) includes a connection flange plate (7), the connection flange plate (7) being formed on an outer peripheral surface of the first end of the valve cartridge (5), the connection flange plate (7) being provided on an end surface of the intake end of the breather pipe (1) and the valve cartridge (5) being located inside the intake end of the breather pipe (1).

6. A liquid filtering device according to claim 1, characterized in that the gas-liquid one-way valve (3) comprises a valve port and a valve ball (25) connected with a spring (24), the valve ball (25) can overcome the spring (24) under the action of gas flow to open the valve port, and after the gas flow stops passing through, the valve ball (25) can cover the valve port again under the action of the spring (24) to close the valve port.

7. A liquid filtering device according to any one of claims 1-6, wherein said vent pipe (1) comprises a passage section between said gas-liquid one-way valve (3) and said gas-liquid proof and permeable membrane (2), said passage section being integrally formed as a suction and evaporation part capable of absorbing and evaporating liquid entering the passage section with the gas flow.

8. The liquid filtration device of claim 7, further comprising a heating unit for increasing the temperature of the wicking volatile component.

9. A liquid filtering device according to claim 7, further comprising a containing cartridge (8) and a cartridge cover (9), the breather tube (1) being arranged in the containing cartridge (8) and being held in place by the cartridge cover (9);

a gas passing port communicated with the gas inlet end of the gas flow channel is formed in the accommodating cylinder (8), and a gas passing port communicated with the gas outlet end of the gas flow channel is formed in the cylinder cover (9);

the wall of the containing cylinder (8) is provided with a volatilization opening (10).

10. A liquid filtering device according to claim 9, wherein the cartridge (8) comprises a heating socket (11), and the edge of the evaporation opening (10) is provided with a heating coil (12) connected to the heating socket (11).

11. A liquid filtering device according to claim 10, wherein the cartridge (8) comprises a plurality of circumferentially spaced volatilization openings (10), and wherein the portions of the cartridge (8) between adjacent volatilization openings (10) are formed as support strips (13), and each support strip (13) is embedded with the heating coil (12).

12. The liquid filtering device according to claim 9, wherein the cartridge cover (9) comprises a sealing gasket accommodating groove (16) and an annular clamping skirt (17) arranged around the sealing gasket accommodating groove (16), the accommodating cartridge (8) comprises an annular connecting flange (18), a sealing gasket (19) is arranged in the sealing gasket accommodating groove (16), the annular clamping skirt (17) and the annular connecting flange (18) are in clamping fit to abut against the sealing gasket (19), and the sealing gasket (19) abuts against the edge of the liquid-proof and breathable membrane (2) on the end face of the exhaust end of the vent pipe (1).

13. A breathing mask, comprising a mask body and a liquid filtering device according to any one of claims 1 to 12, wherein the breathing tube (1) is connected to the mask body for connection to a breathing tube, and the gas-liquid one-way valve (3) is located away from the mask body.

14. A breathing tube having a liquid filtration device according to any one of claims 1 to 12 attached thereto.

15. Breathing support device, comprising a breathing mask (21) and a ventilator (22) connected by a breathing tube (20) according to claim 14, wherein the liquid-proof and gas-permeable membrane (2) is arranged towards the breathing mask (21) and the gas-liquid one-way valve (3) is arranged towards the ventilator (22).